Sizing solution and method of making the same



. i atent Aug. 7, 1923.

E'UDSON A. DE OE'W, OF NEW YORK, N. Y., ASSIGNOR TO PROCESS ENGINEERS, ING, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

$IZING SOLUTION AND METHOD OF MAKING THE SAME.

Bio Drawing. Application filed February 26, 1920, Serial No. 361,430. Renewed December 15, 1922.

T 0 (Liz whom it may concern:

Be it known that I, Jonson A. DE Cnw, a citizen of the United States, residing at New York, N. Y., have invented new and useful Improvements in Sizing Solutions and Methods of Making the Same, of which the following is a specification.

This invention relates to sizing paper and consists of a method of utilizing the special properties of easily soluble, celluloses in the sizing reaction, the effect being to increase the colloidal properties of the precipitate formed when rosin size reacts with a metallic salt in the presence of the specially colloidal materials.

The materials I prefer to use are the muco-celluloses or pecto-celluloses which can be obtained from various sources, or even the alkali celluloses manufactured by special processes from the more resistant celluloses.

The function of these materials is to act as a protective colloid and as they are generally soluble in alkali and used in this form, the can form insoluble metallic salts.

hese mucilaginous products may be obtained readily from such materials as seaweed, lichens, Irish moss, Iceland moss, linseed, broom-seed, quince-seed, etc. The muco-celluloses and pecto-celluloses are readily soluble in slightly alkaline water and form viscous aqueous solutions. When more resistant celluloses are so treated by chemical means that they become readily soluble in alkali, they may be utilized in the same man-.

ner. Such materials are viscose or regenerated cellulose. Y

The method of using these materials for sizing purposes is to add them to the water into which the rosin size is to ,be diluted and then dilute the rosin size in this solution. It is preferable to keep the solution cool as heat will reduce its viscosity.

When the sizing solution which contains the rosin soap and the sodium oellulosic material is added to the paper stockand eventually precipitated with the aluminum salt, the mixture of materials formed is gelatinous in character and is more effective as a sizing agent than the precipitate of rosin and alumina alone. As a preferred method, I heat a rosin soap containing free rosin, force it under pressure into hot water, and then dilute the hot solution in a cold solution containing a slightly alkaline solution of a cellulosic material of the type described.

Viscose has been used before in sizing paper but it has been used for the purpose of replacing the rosin soap and has been used in such quantities as to injure the paper product.

It is not successfully used in any direct method of sizing but may be used effectively by my process as a protective colloid and not as a direct sizing agent. It should be used only in small quantities, the amount being approximately 2% of the amount of rosin used.

What I claim is:

1. A paper sizing solution consisting of rosin soap dissolved in a solution of viscose in water, the amount of viscose being approximately 2% of the weight of the rosin.

2. A method of making paper sizing solution which consists in diluting a hot rosin soap in a cold solution of a cellulosic product.

3. A method of making paper size which consists in heating a rosin soap containmg free rosin, forcing the soap by means of pressure into hot water, and then dilut ng the hot solution in a cold solution contalnlng a slightly alkaline solution of cellulose material.

In testimony whereof, I have signed my name to this specification in the presence of a subscribing witness, this 21st day of February 1920.

V JUDSON A. DE CEW.

Witness:

MARSHALL CLARK. 

